Screw-on hinge with blocked position

ABSTRACT

A screw-on hinge is disclosed for a door or flap which is arranged so as to be swivelable vertically or horizontally at a frame or wall, wherein the door or flap is held in releasable manner in at least one swivel angle position (−5°; +85°; +175°). This screw-on hinge comprises a first hinge part which can be fastened, for example, to the frame, and a second hinge part which can be fastened, for example, to the door or flap. Each of the hinge parts is symmetric with respect to its center bisecting line and comprises a bore hole for receiving a hinge pin arrangement. The hinge pin arrangement comprises a sleeve which is connected with one hinge part so as to be rigid with respect to rotation, and a springing catch device is arranged between the sleeve and the other hinge part. The hinge pin device comprises two parts, and one end of one hinge part which faces the other hinge part forms the catch device, and the catch device is formed by an end face of the sleeve and comprises a helical pressure spring arranged axially inside the sleeve.

BACKGROUND OF THE INVENTION

a) Field of the Invention

The invention is directed to a screw-on hinge for a door or flap whichis arranged so as to be swivelable vertically or horizontally at a frameor wall, wherein the door or flap is held in releasable manner in atleast one swivel angle position, this screw-on hinge comprising a firsthinge part which can be fastened, for example, to the frame, and asecond hinge part which can be fastened, for example, to the door orflap, each of which hinge parts is symmetric with respect to its centerbisecting line and comprises a bore hole for receiving a hinge pinarrangement, wherein the hinge pin arrangement comprises a sleeve whichis connected with one hinge part so as to be fixed with respect torotation, and a springing catch device is arranged between the sleeveand the other hinge part.

b) Description of the Related Art

A screw-on hinge of the type mentioned above is described in U.S. Pat.No. 5,412,842. The known hinge makes it possible to hold a door inreleasable manner at a predetermined position relative to the frame whenthe door is swiveled for the purpose of opening or closing. In the knownarrangement, the sleeve is provided with recessed radial bore holes intowhich spring-loaded balls can run. When the balls run in, the sleeve andtherefore the hinge part (hinge tabs) connected with this sleeve andtherefore also the door are held in the corresponding position with aforce which depends on the spring tension and run-up angle of the balls.Bore hole spaces which are oriented radial to the hinge axis areprovided in one hinge part for receiving the spring. These bore holespaces are open at one end toward the sleeve and receive the balls,while the other end of the bore hole can be closed by a slide at whichthe pressure spring is supported. This is disadvantageous in that itrequires a special construction of the at least one hinge part (hingetab); this special construction leads to an increase in the structuralheight of the hinge part. There are also relatively many structuralcomponent parts. In the embodiment form shown in the reference, there isa total of three balls, three pressure springs and an insertable holdingplate which are necessary for achieving the desired result. Difficultiesalso arise with respect to assembly because the balls, pressure springsand plate cannot be mounted until the sleeve-shaped hinge pin which isprovided with the run-in openings for the balls is in place within thetwo hinge parts. A further disadvantage with balls is the punctiformpressure point which leads to high area pressure and rapid materialwear.

DE 29 41 860 A1 discloses a hinge comprising two hinge parts in whichthe hinge pin is formed by a sleeve in which is arranged a pressurespring which presses the end of the sleeve against an insert in order toachieve an elastic locking at certain rotational angles, wherein the endof the sleeve is provided with projections, the sleeve is connected withone hinge part so as to be rigid with respect to rotation and the insertis arranged in the other hinge part and is provided with radial notches.It is disadvantageous that the two hinge parts can not be fixed axiallyrelative to one another and that the hinge can therefore be used only inconnection with a second hinge of the same type that is constructed inthe opposite sense (page 6, lines 16-21).

DE 24 18 147 discloses a hinge for a motor vehicle door with two hingeparts which are centered by a hinge pin and carry cooperating fittingsurfaces. The fitting surfaces which are outfitted with notches andprojections are pressed onto one another by the weight of the door or bysprings (page 2, line 14), not described more fully, for fastening in anopen position. One hinge part encloses the other in a fork-like manner.

DE 23 42 945 likewise describes a hinge for a motor vehicle door havinga locking device. By means of a helical pressure spring 10 which can bereinforced by a second, coaxially arranged pressure spring 9, controlplates which are provided with radial recesses and connected with onehinge part 3 so as to be rigid with respect to rotation are pressedagainst pins 11, 12 which are guided transversely through the hingebolts 6 which are connected with the other hinge part 1 so as to berigid with respect to rotation.

The hinge in EP 0 266 490 B1 (see FIG. 4) which is provided for alockable vehicle door has two plate spring assemblies which are directedopposite to one another and held by a screw.

DE-OS 22 35 555 discloses hinge straps for a hinge with lockingarrangement having (plate) springs which are disposed coaxially andarranged on the hinge pin (claim 2).

DE 31 26 933 A1 relates to a hinge strap for doors in which lockingpositions are possible. A holding force is caused by residual closingpressure (page 7, line 11).

DE 36 24 649 A1 mentions an upset bolt 4 and accordingly discloses therivet principle for a fixable hinge for motor vehicles.

DE 39 05 351 A1 shows a folding door and also hinges with a catchdevice, wherein, according to column 2, lines 49-51, hinge parts andcatch parts can also be injection molded from plastic and it is alsopossible for a bearing pin made of metal to be injection molded inplastic.

DE 196 19 473 A1 mentions a plastic slide in connection with a removabledoor hinge with a structurally combined door lock.

Most of the hinges known from the references mentioned above lackcompactness, the spring devices are often also visible and not only havean unattractive appearance but also collect dust. Apart from U.S. Pat.No. 5,412,842 (and possibly DE 29 41 860 A1) which was mentioned aboveas the prior art coming closest, none of the references describes ahinge that is suitable for sheet metal cabinet doors.

OBJECT AND SUMMARY OF THE INVENTION

It is the primary object of the invention to avoid the above-mentioneddisadvantages and to provide a screw-on hinge according to the typementioned in the beginning which has a simpler construction, a morecompact outer shape, fewer individual parts, is extensively symmetricand can therefore be mounted more easily and has a longer life.

This object is met in that the hinge pin device comprises two parts andin that one end of one hinge part which faces the other hinge part formsthe catch device, and in that the catch device is formed by an end faceof the sleeve and comprises a helical pressure spring arranged axiallyinside the sleeve.

This feature makes it possible to utilize the space of the hinge boltfor the catch device and the use of one of the screw-on hinge parts ofthe screw-on hinge for this purpose, which caused the problems describedabove, is avoided. In addition, the end face of the sleeve provides acontour surface which makes possible a catch device with relatively lowarea pressure which reduces material wear and prolongs the life of thehinge.

The symmetry of the hinge and its parts facilitates not only assemblybut also subsequent modification of the fitting of the door.

According to a further development of the invention, the catch devicecomprises a shoulder or pocket hole bottom surface which is formed orarranged at the end of the bore hole for the hinge pin in the hinge partand in which are provided recesses or protuberances corresponding toprotuberances or recesses of the end face of the sleeve, wherein thepressure spring presses the sleeve with its protuberances or recessesagainst the shoulder or bottom surface with its recesses andprotuberances (recesses, projections). This is a particularly simplestep for achieving the desired catch positions without using balls whichcan get lost and which, in addition, lead to difficulties when mountingthe hinge.

For simplified production, it is advantageous when the non-rotationalconnection between one hinge part and the hinge pin is achieved by meansof a tongue-in-groove arrangement or, alternately, by a non-circularcross-sectional shape, e.g., a prismatic shape, of the cross section ofthe hinge pin on one hand and of the bore hole in the hinge part inwhich this hinge pin is to be inserted on the other hand.

When the hinge pin has the shape of a sleeve, this is advantageous notonly for economizing on material but also for facilitating theproduction of projections and recesses at the end face of thissleeve-shaped hinge pin. Moreover, there are special advantages to otherembodiment forms to be described below such as the possibility ofaccommodating a helical pressure spring and screw bolt or rivet.

A hinge shape which is especially stable and simple at the same time isone in which one hinge part encloses the other hinge part in the mannerof a fork as is also seen in the prior art. Particularly with this shapeof hinge it is advantageous that the sleeve-shaped hinge pin isconstructed in two parts and that the one end of one hinge pin part,which end faces the other hinge pin part, carries a catch device. Inorder to increase the locking force it is advantageous, according toanother embodiment form of the invention, when catch projections orcatch recesses are provided on the end faces of both hinge pin parts ofthe two-part hinge pin in a corresponding manner, which catchprojections or catch recesses engage in corresponding recesses andprojections formed by annular shoulders in the hinge part bore hole inwhich the corresponding ends of the hinge pin parts are received.

The other end of the hinge pin parts can then be received in the hingepin bore hole of the other hinge part so as to be rigid with respect torotation but possibly so as to slide in axial direction. Because it isheld in a sliding manner, it is ensured that it can deflect in axialdirection when locking or unlocking.

The spring arrangement for the catch device is also advantageouslyconstructed in two parts; in particular, the ends of the spring facingaway from each other can be held by a screw penetrating the springparts, wherein one spring could be supported on the head of the screwand the other spring could be supported on a nut which is screwed ontothe screw. This has the great advantage that the force with which thecatch devices exert the holding force need not be absorbed by parts ofthe hinge so that these hinge parts are additionally loaded, but can beapplied by the screws which do not otherwise exercise any holdingfunction. This step greatly reinforces the stability of the entirearrangement. At the same time, the two fork prongs of the fork-shapedhinge part are relieved of bending forces.

It has proven advantageous when the end face of the sleeve has fourprojections (or raised portions) or recesses having a distance of 90angular degrees from one another. This results in particularly favorableratios for hinges enabling an opening angle of 180°. This arrangementenables a function in which there is locking in the closed position, inthe position which is opened by 180° and at half of the opening angle at90°. Further, this is a good compromise between the quantity of catchprojections and the width of the projections, which leads to a goodcompromise between stability and holding force.

In this case, there should also be four recesses or projections formedby the shoulder and they should have a spacing of 90 angular degrees.Matching these projections and recesses to one another results in aparticularly stable hinge shape and in a particularly high holding forcein the different catch positions.

It is usually advantageous that the catch positions are oriented in sucha way that a catch position is achieved just as the closing position ofthe door or flap is reached. Alternatively, however, the catch devicecan also be constructed in such a way that the spring pressure of thehelical spring within a small angle of rotation extending around thecatch point leads to a torque in the direction of the catch point andthat the orientation of one catch point for the closing position iscarried out in such a way that the catch point is not yet entirelyreached when the door or flap is closed and, therefore, there is atorque acting in the closing direction. As a result of this, the door isheld in its closing position with a certain pressure so that there is noflapping motion or play, as could happen when the door is in the closingposition exactly at the zero point of the catch position.

Usually it is advantageous when the hinge parts are constructed in sucha way that they can be screwed onto mutually flush fastening surfaces ofthe frame on one side and door or flap on the other side.

The invention will be described more fully in the following withreference to embodiment examples shown in the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings:

FIG. 1 is a cross-sectional view showing a thin wall with an openingwhich can be closed by a flap that is held at the thin wall by a hingeconstructed according to the invention;

FIG. 2 shows a reduced view of the flap shown in FIG. 1 in a holdingposition which is open by 90 and which is locked in this position;

FIG. 3 shows a top view of the hinge with axial pin in section;

FIG. 4 shows a top view of the hinge of FIG. 3;

FIG. 5 shows an enlarged view of the locking area according to a firstposition (zero position);

FIG. 6 shows the corresponding area in a second position (diverging fromthe zero position) for generating a torque in the closing direction;

FIG. 7 shows a detailed view of one hinge part which encloses the hingepart shown in FIG. 9 by two fork prongs;

FIG. 8 shows a top view of the engaging hinge part shown in FIG. 7;

FIG. 9 shows a top view of the other, engaged hinge part;

FIG. 10 shows a top view of the engaged hinge part according to FIG. 9;

FIG. 11 shows a side view of a sleeve-like hinge pin part of a two-parthinge pin arrangement such as that used in FIG. 3;

FIG. 12 shows a bottom view of the hinge pin part according to FIG. 11;

FIG. 13 shows a top view of the hinge pin part shown in FIG. 11;

FIG. 14 shows a side view of the associated pressure spring which can bereceived in the sleeve-shaped hinge pin part; and

FIG. 15 shows a side view of the associated flat head screw with nutwhich compresses the springs of the two hinge pin parts.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 shows a screw-on hinge 10 for a door or flap 16 which is arrangedvertically or horizontally at a frame or wall 12 so as to be swivelableabout a shaft 14 and which is held in releasable manner in at least oneswiveling angle position, for example, in one of the positions shown inFIG. 4. The screw-on hinge 10 comprises a first hinge part 18 which canbe fastened, for example, to the frame or to the wall 12, wherein thefastening could be carried out, for example, by means of two countersunkhead screws 20 which are arranged so as to be axially offset (seecorresponding countersunk head openings 22 in FIGS. 3 and 4).Corresponding bore holes are located in a second hinge part 24 which canbe screwed to the door or flap 16, for example. Each of the hinge parts18, 24 has a bore hole 26, 28 (see FIG. 7 or 9) in which a hinge pindevice 30 can be received.

The ratios are shown again in a reduced view in FIG. 2, wherein thesolid line shows the closed door or closed flap inside the wall or frame12 and the dashed line shows another position swiveled by 90° relativethereto which can be a releasably held position. The arrangementaccording to FIG. 2 can be a machine casing 12 and the hinge 10 can holda flap 16 which is swivelable about a horizontal axis; the flap 16 isclosed in horizontal direction in the view shown in dashed lines and,for example, allows access to the machine space for maintenancepurposes.

In contrast, FIG. 1 can represent a door 16 which can be opened andclosed around a vertical shaft 14 and shows sealing strips 32 which areplaced on bevels of the frame or wall 12 and, together with bevels inthe door, make possible a tight closing of the openings that are closedoff by the door 16 when the door 16 is closed.

In order to achieve this sealing effect reliably, it is important that acertain contact pressure is generated by the hinge 30; this is possiblewith the hinge arrangement according to the invention as will bedescribed in the following.

According to FIG. 3, the hinge pin arrangement 30 is formed by twosleeve parts 34′, 34″ which are advisably constructed identically andare shown in a side view in FIG. 11, in a bottom view in FIG. 12 and ina top view in FIG. 13. At its lower end in FIG. 11, the sleeve part 34has an axially oriented, radially projecting strip or spring 38 whichcan be received in a corresponding groove 40 arranged in the area of thehinge pin bore hole 26 formed by the first hinge part 18 in the area ofthe fastening tab 42. Accordingly, this groove 40 weakens the firsthinge part only insignificantly because of this arrangement, whereinthis tongue-in-groove connection serves to hold the sleeve 34 in thebore hole 26 of the two ends of the hinge part 18 so as to be rigid withrespect to rotation but axially displaceable. The other end 44 has acircular end face in which are arranged four recesses 46 that are offsetby 90°. The sleeve 34 forms an axial bore hole 48 which narrows to abore hole 50 of smaller diameter near the end 44. A helical pressurespring 52, which is shown in FIG. 14 and which can be supported on theshoulder 54 formed by the narrowing to the bore hole 50, can be receivedin the bore hole 48 of larger diameter. A screw bolt 56 shown in FIG. 15can be guided through the narrower bore hole 50 as will be describedmore fully below.

The upper end of the sleeve 34 with the end face having the recesses 46can be received in a bore hole 28 which is shown in FIG. 9 in relationto the second hinge part 24. This bore hole also forms a first bore holearea with larger diameter which can receive the sleeve 34 in a rotatableand axially displaceable manner and a second bore hole area 60 whichforms an annular shoulder 58 and which has a smaller diameter that issufficient to allow the shank of the bolt 56 to be guided through. As isshown in FIG. 10 in a bottom view of the part according to FIG. 9, thering-shaped shoulder 58 has four axially protruding projections 62 whichare arranged radially with respect to the hinge axis and are offset by90 relative to one another, their 90 coordinates being oriented at aslight offset with respect to the fastening plane 64, namely, forexample, by −5° as is made clear by the angles given in FIG. 10.

The first hinge part 18 is constructed in such a way that it engagesaround the inner part 68 of the second hinge part 24 with its two legs66, wherein, after corresponding alignment, the bore holes 26 of the twolegs 66 of the first hinge part 18 are flush with the two bore holes 28of the second hinge part 24 which are arranged symmetric to the middleof the hinge part 67. In this position, a sleeve part 34 can be insertedby its side 44 having the narrower bore hole 50 into the bore holes 26of the first hinge part 18 from the outside until this side 44 haspenetrated into and filled the bore hole 28 of the second hinge part 24,wherein the structural component part 34 with its spring part 38 is atthe same time oriented in such a way that this spring 38 moves into thegroove 40. This mounted position is shown in FIG. 3. Subsequently, apressure spring 52 can be introduced into the two sleeves which openoutward, whereupon, finally, the screw bolt 56 shown in FIG. 15 isguided, e.g., first through the lower pressure spring and accordinglythrough the bore hole 26 of the hinge part 18 and the (lower) bore hole28 of the hinge part 24, subsequently through the bore hole 50 of thesleeve 34 arranged at bottom, then through the bore hole 60 of the hingepart 24, then through the bore hole 50 of a second sleeve part 34 whichis inserted into the upper bore hole 28 of hinge part 24 in the oppositedirection, through a second pressure spring 52 and accordingly throughthe bore hole 28 of the second hinge part and through the larger part ofthe bore hole 26 of the hinge part 18. In this position, the head 70 ofthe screw bolt 56 contacts the lower end of the lower pressure spring 52shown in FIG. 3 and a nut 72 which is screwed to the upper thread of thescrew bolt 56 forms a support for the upper end of the upper pressurespring 52 shown in FIG. 3. The flat head screw or screw bolt 56preferably extends such that the two engaged pressure springs 52 aretensioned to a certain extent and the two sleeve parts 34′ and 34″according to FIG. 3 accordingly move toward one another with their endfaces having the recesses 46 and are therefore pressed onto theshoulders of the inner part 61 of the second hinge part 24, whichshoulders have the projections 62. In the position which is displaced by5°, for instance, as is shown in FIG. 10, the projection 62 and recess46 match one another exactly as can be seen in FIG. 5 and the hinge hasreached a catch position. This catch position is displaced by 5° inclockwise direction with respect to the hinge part 24 in the arrangementshown in FIG. 1, so that a certain pressure is exerted on the door leaf16. Since the door frame does not allow this 5-degree displacement, theprojection surface 62 according to FIG. 5 which is semicircular, forexample, moves upward on a side surface of the trough-shaped offset 46,which side surface extends diagonally, for example, and accordinglyincreases the distance between the two structural component parts as canbe seen in FIG. 6. This leads to a compression of the correspondingpressure spring 52. The pressure spring 52 tries to cancel this movementand presses the hinge part 24 in clockwise direction and therefore,according to FIG. 1, pushes the door into the closed position (see arrow74).

Since this pressure or torque is generated by two springs 52, thecontact pressure force is doubled.

The length of the flat head screw 56 is advisably selected in such a waythat it vanishes inside the hinge parts. The hinge accordingly has anattractive appearance because the built-in catch device is not visible.

In the present embodiment form, a hinge according to FIG. 4 isconstructed in such a way that it has catch points at −5, at 85 and at175. At the −5-degree position, the frame or the wall presses the doorinto the 0-degree position and contact pressing pressure occurs. In the85-degree position, the door stays in the open position and the doorleaf projects away from the fastening surface essentially at rightangles. Finally, there is another open position which has a catch pointat 175, wherein the hinge shown here enables this large opening angle(see the dashed line in FIG. 4) because it is a 180-degree hinge.

The flat head screw 56 compressing the springs 52 makes it possible toadjust the pressing force and therefore the catching holding force bytightening or loosening the nut 72. If it is possible to dispense withthis adjustability, a rivet of suitable length and with matchingdiameter can be used instead of the flat head screw 56, for example, inthe form of a hollow rivet or compression rivet, one of whose rivetheads functions as a screw head, while the other rivet head takes overthe function of the nut or flat head screw.

The hinge parts can be injection-molded from metal or preferably fromplastic. When made of plastic, the catch surfaces offer low coefficientsof friction. But it can also be advantageous for higher loading capacityto form the catch surfaces from a metal part which is introduced orinjected into the plastic.

It is also possible to construct the hinge pin device from two sleeveswhich are inserted one inside the other, wherein the outer, first sleeveis fixedly connected (e.g., pressed or glued) with one hinge part, sothat this sleeve is not axially displaceable with respect to the hingein the assembled state. The inner, second sleeve is arranged inside thisfirst, outer sleeve so as to be axially displaceable and rotatable. Theouter sleeve can then form one catch surface with an annular shoulderwhich projects inward radially, while the other inner sleeve forms thecorresponding second catch surface rotating on it, wherein this sleeveis suitably connected with the other hinge part so as to be rigid withrespect to rotation but displaceable axially. The inner sleeve thenreceives the spring which presses the catch surfaces of the two sleevesagainst one another. The spring is penetrated by a retaining pin orretaining rivet, which latter may also be in the shape of a sleeve, asthe case may be. This arrangement is particularly stable and makespossible a particularly strong hinge with hinge tabs of plastic in whichthe sleeves which are made of metal, for example, are embedded.

The invention is commercially applicable in switch cabinet construction.

While the foregoing description and drawings represent the presentinvention, it will be obvious to those skilled in the art that variouschanges may be made therein without departing from the true spirit andscope of the present.

What is claimed is:
 1. A screw-on hinge for a door or flap which isarranged so as to be swivelable around a hinge-axis vertically orhorizontally at a frame or wall, wherein the door or flap is held inreleasable manner in at least one swivel angle position, said screw-onhinge comprising: a first hinge part which can be fastened to the frame;a second hinge part which can be fastened to the door or flap; each ofsaid hinge parts being symmetric with respect to a center bisecting lineand each of said hinge parts having a bore hole for a hinge pinarrangement; the hinge pin arrangement comprising: a first sleevearrangement connected to the first hinge part so said first sleevearrangement being not rotatable with respect to said first hinge part;and a second sleeve arrangement being connected to said second hingepart so said second sleeve arrangement is not rotatable with respect tosaid second hinge part, said first sleeve arrangement comprising twoends with receiving bores, said second sleeve arrangement comprising twoparts being rotatably embraced by the receiving bores, a spring loadedcatch device arranged between said first sleeve arrangement and saidsecond sleeve arrangement, wherein the catch device is formed by endfaces of the second sleeve arrangement and comprises a helical pressurespring arranged axially inside each of the sleeve arrangements.
 2. Thescrew-on hinge according to claim 1, wherein the non-rotationalconnection between said first sleeve arrangement and said first hingepart is achieved by a tongue-in-groove arrangement or by a prismatic ornon-round cross-sectional shape.
 3. The screw-on hinge according toclaim 1, wherein said first hinge part encloses the said second hingepart.
 4. The screw-on hinge according to claim 1, wherein the two endfaces of the second sleeve parts which end faces face one another, areprovided with projections or recesses which engage in correspondingrecesses and projections formed by annular shoulders in the hinge partbore hole in which the corresponding end faces are received.
 5. Thescrew-on hinge according to claim 4, wherein the other respective end ofthe hinge pin parts is received in the hinge pin bore hole of the otherhinge part so as to be rigid with respect to rotation but so as to slidein axial direction.
 6. The screw-on hinge according to claim 1, whereinthe ends of the helical pressure springs face away from each other arepressed together by a screw penetrating the spring parts, wherein onespring is supported on the head of the screw and the other spring issupported on a nut which is screwed on.
 7. The screw-on hinge accordingto claim 6, wherein a rivet presses the pressure springs togetherinstead of the screw bolt.
 8. The screw-on hinge according to claim 7,wherein the rivet is a hollow rivet.
 9. The screw-on hinge according toclaim 1, wherein the end faces of the second sleeve arrangement has fourprojections or recesses having a distance of 90 angular degrees from oneanother.
 10. The screw-on hinge according to claim 1, wherein there arealso four recesses or projections formed by the shoulder which have aspacing of 90 angular degrees relative to one another, wherein the0-degree orientation of the recesses and projections with respect to thefastening surface of the hinge has a displacement of a few degrees. 11.The screw-on hinge according to claim 10, wherein the displacement isabout 5°.
 12. The screw-on hinge according to claim 10, wherein theorientation of the catch locations is carried out in such a way thatthis catch position is just reached when the door or flap is in theclosed position.
 13. The screw-on hinge according to claim 10, whereinthe catch device is constructed in such a way that the spring pressureof the helical spring within a small angle of rotation extending aroundthe catch point leads to a torque in the direction of the catch point,and in that the orientation of one catch point for the closing positionis carried out in such a way that a torque acting in the closingdirection occurs on the door or flap when this door or flap is closed.14. The screw-on hinge according to claim 1, wherein the hinge parts areconstructed in such a way that they can be screwed onto fasteningsurfaces of the frame and door or flap, which fastening surfaces areflush with one another.
 15. The screw-on hinge according to claim 1,wherein the hinge parts are injection molded from plastic.
 16. Thescrew-on hinge according to claim 15, wherein the catch surfaces of theone hinge part are formed from a metal part which is introduced and, inparticular, injected, into the plastic.
 17. The screw-on hinge accordingto claim 1, wherein the hinge pin device is formed of a first sleevewhich is fixedly connected with one hinge part and a second sleeve whichis connected with the other hinge part so as to be rigid with respect torotation but displaceable axially, wherein the second sleeve is arrangedin the first sleeve and the first sleeve forms an annular shoulder withcatch devices, which annular shoulder projects inward radially, the endface of the second sleeve rests on these catch devices by acorresponding catch device under spring force which is generated by ahelical pressure spring arranged inside the second sleeve.
 18. Thescrew-on hinge according to claim 17, wherein the two sleeves are madeof different materials such as metal and plastic.
 19. The screw-on hingeaccording to claim 17, wherein the helical pressure spring(s) is (are)held under tension by a screw bolt or rivet, particularly a hollowrivet.